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use async_trait::async_trait;
use azalea_core::resource_location::ResourceLocation;
use byteorder::{BigEndian, WriteBytesExt};
use std::io::Write;
use super::MAX_STRING_LENGTH;
#[async_trait]
pub trait Writable {
fn write_list<F, T>(&mut self, list: &[T], writer: F) -> Result<(), std::io::Error>
where
F: FnOnce(&mut Self, &T) -> Result<(), std::io::Error> + Copy,
T: Sized,
Self: Sized;
fn write_int_id_list(&mut self, list: Vec<i32>) -> Result<(), std::io::Error>;
fn write_map<KF, VF, KT, VT>(
&mut self,
map: Vec<(KT, VT)>,
key_writer: KF,
value_writer: VF,
) -> Result<(), std::io::Error>
where
KF: Fn(&mut Self, KT) -> Result<(), std::io::Error> + Copy,
VF: Fn(&mut Self, VT) -> Result<(), std::io::Error> + Copy,
Self: Sized;
fn write_byte(&mut self, n: u8) -> Result<(), std::io::Error>;
fn write_bytes(&mut self, bytes: &[u8]) -> Result<(), std::io::Error>;
fn write_varint(&mut self, value: i32) -> Result<(), std::io::Error>;
fn write_utf_with_len(&mut self, string: &str, len: usize) -> Result<(), std::io::Error>;
fn write_utf(&mut self, string: &str) -> Result<(), std::io::Error>;
fn write_short(&mut self, n: i16) -> Result<(), std::io::Error>;
fn write_byte_array(&mut self, bytes: &[u8]) -> Result<(), std::io::Error>;
fn write_int(&mut self, n: i32) -> Result<(), std::io::Error>;
fn write_boolean(&mut self, b: bool) -> Result<(), std::io::Error>;
fn write_nbt(&mut self, nbt: &azalea_nbt::Tag) -> Result<(), std::io::Error>;
fn write_long(&mut self, n: i64) -> Result<(), std::io::Error>;
fn write_resource_location(
&mut self,
location: &ResourceLocation,
) -> Result<(), std::io::Error>;
}
#[async_trait]
impl Writable for Vec<u8> {
fn write_list<F, T>(&mut self, list: &[T], writer: F) -> Result<(), std::io::Error>
where
F: FnOnce(&mut Self, &T) -> Result<(), std::io::Error> + Copy,
Self: Sized,
{
self.write_varint(list.len() as i32)?;
for item in list {
writer(self, item)?;
}
Ok(())
}
fn write_int_id_list(&mut self, list: Vec<i32>) -> Result<(), std::io::Error> {
self.write_list(&list, |buf, n| buf.write_varint(*n))
}
fn write_map<KF, VF, KT, VT>(
&mut self,
map: Vec<(KT, VT)>,
key_writer: KF,
value_writer: VF,
) -> Result<(), std::io::Error>
where
KF: Fn(&mut Self, KT) -> Result<(), std::io::Error> + Copy,
VF: Fn(&mut Self, VT) -> Result<(), std::io::Error> + Copy,
Self: Sized,
{
self.write_varint(map.len() as i32)?;
for (key, value) in map {
key_writer(self, key)?;
value_writer(self, value)?;
}
Ok(())
}
fn write_byte(&mut self, n: u8) -> Result<(), std::io::Error> {
WriteBytesExt::write_u8(self, n)
}
fn write_bytes(&mut self, bytes: &[u8]) -> Result<(), std::io::Error> {
self.extend_from_slice(bytes);
Ok(())
}
fn write_varint(&mut self, mut value: i32) -> Result<(), std::io::Error> {
let mut buffer = [0];
if value == 0 {
self.write_all(&buffer).unwrap();
}
while value != 0 {
buffer[0] = (value & 0b0111_1111) as u8;
value = (value >> 7) & (i32::max_value() >> 6);
if value != 0 {
buffer[0] |= 0b1000_0000;
}
self.write_all(&buffer)?;
}
Ok(())
}
fn write_utf_with_len(&mut self, string: &str, len: usize) -> Result<(), std::io::Error> {
if string.len() > len {
panic!(
"String too big (was {} bytes encoded, max {})",
string.len(),
len
);
}
self.write_varint(string.len() as i32)?;
self.write_bytes(string.as_bytes())
}
fn write_utf(&mut self, string: &str) -> Result<(), std::io::Error> {
self.write_utf_with_len(string, MAX_STRING_LENGTH.into())
}
fn write_short(&mut self, n: i16) -> Result<(), std::io::Error> {
WriteBytesExt::write_i16::<BigEndian>(self, n)
}
fn write_byte_array(&mut self, bytes: &[u8]) -> Result<(), std::io::Error> {
self.write_varint(bytes.len() as i32)?;
self.write_bytes(bytes)
}
fn write_int(&mut self, n: i32) -> Result<(), std::io::Error> {
WriteBytesExt::write_i32::<BigEndian>(self, n)
}
fn write_boolean(&mut self, b: bool) -> Result<(), std::io::Error> {
self.write_byte(if b { 1 } else { 0 })
}
fn write_nbt(&mut self, nbt: &azalea_nbt::Tag) -> Result<(), std::io::Error> {
nbt.write(self)
.map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
}
fn write_long(&mut self, n: i64) -> Result<(), std::io::Error> {
WriteBytesExt::write_i64::<BigEndian>(self, n)
}
fn write_resource_location(
&mut self,
location: &ResourceLocation,
) -> Result<(), std::io::Error> {
self.write_utf(&location.to_string())
}
}
pub trait McBufWritable
where
Self: Sized,
{
fn write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error>;
}
pub trait McBufVarintWritable
where
Self: Sized,
{
fn varint_write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error>;
}
impl McBufWritable for i32 {
fn write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
Writable::write_int(buf, *self)
}
}
impl McBufVarintWritable for i32 {
fn varint_write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
buf.write_varint(*self)
}
}
impl McBufWritable for Vec<u8> {
fn write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
buf.write_bytes(self)
}
}
// string
impl McBufWritable for String {
fn write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
buf.write_utf(self)
}
}
// ResourceLocation
impl McBufWritable for ResourceLocation {
fn write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
buf.write_resource_location(self)
}
}
// u32
impl McBufWritable for u32 {
fn write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
buf.write_varint(*self as i32)
}
}
// u32 varint
impl McBufVarintWritable for u32 {
fn varint_write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
buf.write_varint(*self as i32)
}
}
// u16
impl McBufWritable for u16 {
fn write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
buf.write_varint(*self as i32)
}
}
// u16 varint
impl McBufVarintWritable for u16 {
fn varint_write_into(&self, buf: &mut Vec<u8>) -> Result<(), std::io::Error> {
buf.write_varint(*self as i32)
}
}
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